test/test_utils.py

   1 #-------------------------------------------------------------------------------
   2 # elftools tests
   3 #
   4 # Eli Bendersky (eliben@gmail.com)
   5 # This code is in the public domain
   6 #-------------------------------------------------------------------------------
   7 import unittest
   8 from io import BytesIO
   9 from random import randint
  10
  11 from elftools.common.utils import (parse_cstring_from_stream, merge_dicts,
  12         preserve_stream_pos)
  13
  14
  15 class Test_parse_cstring_from_stream(unittest.TestCase):
  16     def _make_random_bytes(self, n):
  17         return b''.join(bytes((randint(32, 127),)) for i in range(n))
  18
  19     def test_small1(self):
  20         sio = BytesIO(b'abcdefgh\x0012345')
  21         self.assertEqual(parse_cstring_from_stream(sio), b'abcdefgh')
  22         self.assertEqual(parse_cstring_from_stream(sio, 2), b'cdefgh')
  23         self.assertEqual(parse_cstring_from_stream(sio, 8), b'')
  24
  25     def test_small2(self):
  26         sio = BytesIO(b'12345\x006789\x00abcdefg\x00iii')
  27         self.assertEqual(parse_cstring_from_stream(sio), b'12345')
  28         self.assertEqual(parse_cstring_from_stream(sio, 5), b'')
  29         self.assertEqual(parse_cstring_from_stream(sio, 6), b'6789')
  30
  31     def test_large1(self):
  32         text = b'i' * 400 + b'\x00' + b'bb'
  33         sio = BytesIO(text)
  34         self.assertEqual(parse_cstring_from_stream(sio), b'i' * 400)
  35         self.assertEqual(parse_cstring_from_stream(sio, 150), b'i' * 250)
  36
  37     def test_large2(self):
  38         text = self._make_random_bytes(5000) + b'\x00' + b'jujajaja'
  39         sio = BytesIO(text)
  40         self.assertEqual(parse_cstring_from_stream(sio), text[:5000])
  41         self.assertEqual(parse_cstring_from_stream(sio, 2348), text[2348:5000])
  42
  43
  44 class Test_preserve_stream_pos(unittest.TestCase):
  45     def test_basic(self):
  46         sio = BytesIO(b'abcdef')
  47         with preserve_stream_pos(sio):
  48             sio.seek(4)
  49         self.assertEqual(sio.tell(), 0)
  50
  51         sio.seek(5)
  52         with preserve_stream_pos(sio):
  53             sio.seek(0)
  54         self.assertEqual(sio.tell(), 5)
  55
  56
  57 class Test_merge_dicts(unittest.TestCase):
  58     def test_basic(self):
  59         md = merge_dicts({10: 20, 20: 30}, {30: 40, 50: 60})
  60         self.assertEqual(md, {10: 20, 20: 30, 30: 40, 50: 60})
  61
  62     def test_keys_resolve(self):
  63         md = merge_dicts({10: 20, 20: 30}, {20: 40, 50: 60})
  64         self.assertEqual(md, {10: 20, 20: 40, 50: 60})
  65
  66
  67 if __name__ == '__main__':
  68     unittest.main()